Your job is to classify a newly discovered animal species. Your initial studies reveal that your specimen has tissues but lacks organs; has no head, body cavity, or segmentation; and has radial symmetry. To what phylum does this animal belong?
A) Cnidaria
B) Mollusca
C) Annelida
D) Platyhelminthes
E) Porifera
A
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Viruses are not considered as alive, yet they share with living cells the ability to
A. evolve. B. respond to stimuli. C. metabolize food. D. reproduce on their own. E. produce cell membranes.
On Easter Island in the Pacific Ocean, the population rose to 3000 people from the original population of 100. In time,
the entire island was cultivated, and eventually, the soils became so over-cultivated that crops could no longer be grown. People started dying from starvation and disease. This Easter Island population had exceeded its ____.
a. density-independent factors b. biotic potential c. logistic growth d. carrying capacity e. opportunistic life history
The organism shown above is using which of
the following types of reproduction? a. asexual budding b. sexual production of eggs c. hermaphroditic co-fertilization d. a combination of all three e. none of these
Microbiological contaminants are best described as
A. vegetative microbes present on or in a substance. B. pathogenic microbes present on or in a substance. C. unwanted microbes present on or in a substance. D. any and all microbes present on or in a substance.